/Engine/Plugins/Runtime/RigVM/Source/RigVMEditor/Public/Editor/RigVMEditor.h
Whenever new graphs need to be created it will use this schema by default.
virtual [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UEdGraphSchema](API\Runtime\Engine\EdGraph\UEdGraphSchema) > GetDefaultSchemaClass() const